The big annoyance was that back in the day, with posting boards and guestbooks being all the rage, (or just a badly made web page) people would open a blink tag and never close it and the browser would render everything after it on the page as blinking.

But at least it doesn’t have a spillover effect of turning every post that comes after it into an animated gif meme version of itself (as long as no one makes “memification” a feature of markdown, aynway).